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PHPからAndroidにデータを取得するにはどうすればよいですか?

どうすればPHPの結果をAndroid textviewに表示できますか?これは私のPHPコードです。これにはJSONを使用する必要があります...

<? php
mysql_connect("localhost","root","");

mysql_select_db("mydatabase");

$query = "SELECT SUM(OrderPrice) as total FROM tbl_user";
$result = mysql_query($query);


while($row = mysql_fetch_assoc($result))
{
$new_arr[] = $row['total'];
}
echo json_encode($new_arr);

?>
4

4 に答える 4

0

これは、CITY_ID と CITY_NAME フィールドを持つデータベース 'deal' とテーブル 'city' を持つ ur php ファイル db.php であるとします。

<?php

$con = mysql_connect('localhost', 'root', '');

if (!$con)
{
die("could not connect: " + mysql_error());
}
mysql_select_db("deal", $con);

$result=mysql_query("SELECT * FROM city ", $con);
while ($row = mysql_fetch_assoc($result))
{
$output[]=$row;
}
print(json_encode($output));
mysql_close($con);   
?>
于 2013-08-14T07:52:57.740 に答える
0

問題は、デバイスで直接 php を読み取るか、ウェブサーバーからリクエストするかです。最初のものを実行することもできますが、Web サーバーをデバイスにインストールする必要があります。たとえば、「localhost と 127.0.0.1」は Web サーバーがなくても機能する可能性があります。次のクラスまたはライブラリを使用してデータを取得できます。ダムである可能性があります。 ! 2 つ目は簡単です。PHP をサーバーに配置し、クライアント アプリが http/https などで呼び出します。

  1. シンプルな接続:

    public static class Connector extends AsyncTask<String, Object, Object> {
    private static final int   DEFAULT_CNN_TIME_OUT = 1000 * 20;
    private static String      USER_AGENT;
    private static final int[] LOCK                 = new int[1];
    private String             mUrl;
    private byte[]             mBody;
    
    public Connector( Context _cxt ) {
        super();
        if( TextUtils.isEmpty( USER_AGENT ) ) {
            // Without this, the default provided by API will be like "Dalvik/1.6.0 (Linux; U; Android 4.0.4; BASE_Lutea_3 Build/IMM76D)" .
            USER_AGENT = new WebView( _cxt ).getSettings().getUserAgentString();
        }
    }
    
    /*
     * Convenient function to execute the connecting task.
     */
    public void submit( String _url ) {
        this.execute( _url );
    }
    
    @Override
    protected Object doInBackground( String... _params ) {
        mUrl = _params[0];
        Object ret = null;
        HttpURLConnection conn = null;
        try {
            synchronized( LOCK ) {
                InputStream in = null;
                conn = connect( mUrl );
                // if we don't do conn.setRequestProperty( "Accept-Encoding", "gzip" ), the wrapper GZIPInputStream can be removed.
                onConnectorInputStream( in = new GZIPInputStream( conn.getInputStream() ) );
                in.close();
                in = null;
            }
        }
        catch( Exception _e ) {
            ret = _e;
        }
        finally {
            if( conn != null ) {
                conn.disconnect();
                conn = null;
            }
        }
        return ret;
    }
    
    @Override
    protected void onPostExecute( Object _result ) {
        if( _result instanceof SocketTimeoutException ) {
            onConnectorConnectTimout();
        } else if( _result instanceof ConnectorPostConnectException ) {
            onConnectorError( ((ConnectorPostConnectException) _result).getStatus() );
        } else if( _result instanceof Exception ) {
            onConnectorInvalidConnect( (Exception) _result );
        } else if( _result == null ) {
            onConnectorFinished();
        }
        handleEstablishedConnection();
    }
    
    /*
     * Internal help and test function.
     */
    private static void handleEstablishedConnection() {
        try {
            Log.v( TAG, "Connection is established." );
            CookieStore cs = CookieManager.getInstance().getCookieStore();
            if( cs != null ) {
                Log.v( TAG, "------------cookies------------" );
                List<Cookie> list = cs.getCookies();
                if( list != null && list.size() > 0 ) {
                    StringBuilder cookieBuilder = new StringBuilder();
                    for( Cookie c : list ) {
                        cookieBuilder
                                .append( c.getName().trim() )
                                .append( "=>" )
                                .append( c.getValue().trim() )
                                .append( "=>" )
                                .append( c.getDomain() );
                        Log.v( TAG, cookieBuilder.toString() );
                        cookieBuilder.delete( 0, cookieBuilder.length() - 1 );
                    }
                    cookieBuilder = null;
                } else {
                    Log.v( TAG, "Empty cookies." );
                }
                cs = null;
                list = null;
            }
        }
        catch( Exception _e ) {
            Log.e( TAG, "Error in handleEstablishedConnection: " + _e.getMessage() );
        }
        finally {
        }
    }
    
    private HttpURLConnection connect( String _urlStr ) throws Exception {
        URL url = null;
        HttpURLConnection conn = null;
        try {
            try {
                url = new URL( _urlStr );
            }
            catch( MalformedURLException e ) {
                throw new IllegalArgumentException( "Invalid url: " + _urlStr );
            }
            conn = preConnect( url );
            doConnect( conn );
            conn = postConnect( conn );
        }
        catch( Exception _e ) {
            throw _e;
        }
        finally {
            url = null;
        }
        return conn;
    }
    
    private HttpURLConnection preConnect( URL url ) throws Exception {
        HttpURLConnection conn;
        conn = (HttpURLConnection) url.openConnection();
        conn.setUseCaches( false );
        // http://www.aswinanand.com/2009/01/httpurlconnectionsetfollowredirects-bug/comment-page-1/#comment-13330
        // see the url to learn more about the problem of redirect
        conn.setInstanceFollowRedirects( false );
        conn.setDoOutput( true );// allows body
        mBody = getBody();
        if( hasBody() ) {
            conn.setFixedLengthStreamingMode( mBody.length );
        }
        conn.setRequestMethod( "POST" );
        conn.setRequestProperty( "Connection", "Keep-Alive" );
        conn.setRequestProperty( "Content-Type", "application/x-www-form-urlencoded;charset=UTF-8" );
        conn.setRequestProperty( "User-Agent", USER_AGENT );
        conn.setRequestProperty( "Accept-Encoding", "gzip" );// force server to send in Content-Encoding: gzip .
        String cookies = onCookie();
        if( !TextUtils.isEmpty( cookies ) ) {
            conn.setRequestProperty( "Cookie", onCookie() );
            cookies = null;
        }
        conn.setConnectTimeout( onSetConnectTimeout() );
        return conn;
    }
    
    /*
     * Convenient function to check the exiting of body.
     */
    private boolean hasBody() {
        return mBody != null && mBody.length > 0;
    }
    
    private void doConnect( HttpURLConnection conn ) throws Exception {
        OutputStream out; // the outgoing stream
        out = conn.getOutputStream();
        if( hasBody() ) {
            out.write( mBody );
        }
        out.close();
        out = null;
    }
    
    private HttpURLConnection postConnect( HttpURLConnection conn ) throws Exception {
        int status = conn.getResponseCode();
        if( status != HttpURLConnection.HTTP_OK ) {
            throw new ConnectorPostConnectException( status );
        } else {
            CookieManager.getInstance().put( conn.getURL().toURI(), conn.getHeaderFields() );
            return conn;
        }
    }
    
    private byte[] getBody() {
        byte[] body = null;
        String bodyString = onSetBody();
        if( !TextUtils.isEmpty( bodyString ) ) {
            body = bodyString.getBytes();
        }
        return body;
    }
    
    // ------------------------------------------------
    // Overrides methods here
    // ------------------------------------------------
    
    protected int onSetConnectTimeout() {
        return DEFAULT_CNN_TIME_OUT;
    }
    
    protected String onCookie() {
        return null;
    }
    
    protected String onSetBody() {
        return null;
    }
    
    protected void onConnectorConnectTimout() {
        Log.e( TAG, "Handling connector timeout gracefully." );
    }
    
    protected void onConnectorError( int _status ) {
        Log.e( TAG, "Handling connector error(responsed) gracefully: " + _status );
    }
    
    protected void onConnectorInvalidConnect( Exception _e ) {
        Log.e( TAG, "Handling connector invalid connect(crash) gracefully: " + _e.toString() );
    }
    
    /*
     * Read data here. The function runs in thread. To hook on UI thread use onConnectorFinished()
     */
    protected void onConnectorInputStream( InputStream _in ) {
    }
    
    /*
     * Last handler for a success connection
     */
    protected void onConnectorFinished() {
    }
    }
    
  2. Volley を使用して応答を取得します: https://github.com/ogrebgr/android_volley_examples/blob/master/src/com/github/volley_examples/Act_SimpleRequest.java

  3. jsoup を使用して「生の html」を取得します: http://jsoup.org/

于 2013-08-14T07:53:18.283 に答える
0

こんにちは、これらのリンクを使用できます:

Android で JSONを解析する, Android JSON 解析チュートリアル

于 2013-08-14T07:30:58.470 に答える